Developers in the jailbreak scene continuously work on standardizing PS3 emulation or container layers for the PS4.
PKG UPD is a system software update file used by the PS4 to update its operating system. The file contains data that is used to patch and improve the PS4's performance, security, and features. In some cases, issues with the PKG UPD file can cause problems with the PS4's visual output, leading to blurry images.
Before diving into Blur specifically, let's break down the search term:
The game was rebuilt and compiled to run natively on the PS4's Orbis OS architecture.
It sounds like you're looking for information on a (likely a tutorial, article, or video) about Blur on PS4 — specifically its PKG and update files.
Despite being an unofficial project, the community has managed to port the core experience successfully.